Investor · Menlo Park, CA

Beth Seidenberg, M.D

Open Beth in the network graph →

Filings

15

SEC Form D

Connections

43

co-filers

Capital

$223.5M

across filings

Active

Jan 2018

to Oct 2025

Most-connected co-filers (43)

Jonathan A. Bloom · New York, NY9 shared Andrew Pierce · Sheridan, WY7 shared Kevin Forrest, Ph.D · San Diego, CA6 shared William Chisholm · MENLO PARK, CA5 shared Peter Henn · Farmington Hills, MI5 shared Gregory D. Bonifield · Raleigh, NC5 shared 400 Capital GP LLC · New York, NY5 shared Christian J. Rottenkolber · Farmington Hills, MI5 shared Mark C. Moore · Boston, MA5 shared Christopher Hentemann · New York, NY5 shared Marc T. Bala · MENLO PARK, CA5 shared Jeffrey Saling · Reno, NV5 shared Douglas M. Haines, Jr · MENLO PARK, CA5 shared Stephen M. Henkenmeier · MENLO PARK, CA5 shared John T. Treadwell · MENLO PARK, CA5 shared Clare Ozawa, Ph.D · San Diego, CA3 shared Joyful Ventures Management Company, LLC · West Hollywood, CA2 shared Jennifer Stojkovic · Gainesville, FL2 shared Henry Vess · Beverly Hills, CA2 shared Nathan Runkle · Los Angeles, CA2 shared Dan Teran · New York, NY2 shared Alan Shtraks · Richmond, VA2 shared Roger Brown · St Louis, MO2 shared Richard Baur · St Louis, MO2 shared

Recent filings (15)

Electra Therapeutics, Inc.Oct 2025 · 11 co-filers$184.1M Electra Therapeutics, Inc.Oct 2025 · 11 co-filers$184.1M Leaselot, Inc.Jun 2025 · 8 co-filers$2.0M Leaselot, Inc.Aug 2024 · 8 co-filers$4.0M Kate Therapeutics Inc.Aug 2024 · 8 co-filers$35.0M Kate Therapeutics Inc.Aug 2024 · 8 co-filers$23.4M Kate Therapeutics Inc.Aug 2024 · 8 co-filers$35.0M Kate Therapeutics Inc.Aug 2024 · 5 co-filers$16.0M Kate Therapeutics Inc.Aug 2024 · 8 co-filers$23.4M Kate Therapeutics Inc.Aug 2024 · 5 co-filers$16.0M Joyful Ventures Fund I, LPNov 2023 · 12 co-filers$21.2M STG AV, L.P.Oct 2023 · 14 co-filers STG WARRIOR, L.P.Aug 2023 · 14 co-filers STG MERCURY, L.P.May 2023 · 14 co-filers Joyful Ventures Fund I, LPNov 2022 · 12 co-filers STG VII, L.P.Oct 2022 · 14 co-filers$3.0B STG VII-A, L.P.Oct 2022 · 14 co-filers$3.0B Expansion Therapeutics, Inc.Oct 2021 · 9 co-filers$80.1M Expansion Therapeutics, Inc.Oct 2021 · 9 co-filers$80.1M Expansion Therapeutics, Inc.Jan 2018 · 13 co-filers$55.3M Expansion Therapeutics, Inc.Jan 2018 · 13 co-filers$55.3M

Derived from public SEC Form D (Reg D) filings; entities resolved probabilistically. See Beth in the interactive graph →